1/* Copyright (C) 2003-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <stdio.h>
20#include <unistd.h>
21#include <sys/time.h>
22#include <time.h>
23
24
25/* Test that nanosleep() does sleep. */
26static int
27do_test (void)
28{
29 /* Current time. */
30 struct timeval tv1;
31 (void) gettimeofday (tv: &tv1, NULL);
32
33 struct timespec ts;
34 ts.tv_sec = 1;
35 ts.tv_nsec = 0;
36 TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
37
38 /* At least one second must have passed. */
39 struct timeval tv2;
40 (void) gettimeofday (tv: &tv2, NULL);
41
42 tv2.tv_sec -= tv1.tv_sec;
43 tv2.tv_usec -= tv1.tv_usec;
44 if (tv2.tv_usec < 0)
45 --tv2.tv_sec;
46
47 if (tv2.tv_sec < 1)
48 {
49 puts (s: "nanosleep didn't sleep long enough");
50 return 1;
51 }
52
53 return 0;
54}
55
56#define TEST_FUNCTION do_test ()
57#include "../test-skeleton.c"
58

source code of glibc/posix/tst-nanosleep.c